Alexander Lukashenko, Europe’s longest-serving leader, has extended his 31-year rule in Belarus after being declared the winner of a presidential election that his exiled opponents and Western countries have denounced as a sham.

Europe’s longest-serving leader won re-election in a contest widely believe to have been rigged. The result cements the power of a leader whose country is considered Russia’s staunchest ally.

Belarusian leader Alexander Lukashenko extended his 31-year rule with a massive win in a presidential election that Western governments have rejected as a sham, according to preliminary results on Monday.